X d die casting machine



.I. S. GULLBORG.

DIE CASTING MACHINE.

APPLICATION FILED MAY 24. 1918.

Patented Nov. 18, 1919.

8 SHEETSSHEET l.

sw w mww p QM NAN mm J. S. GULLBORG.

DIE CASTING MACHINE.

APPLICATION FILED MAY24.19I8.

Patented Nov. 18, 1919.

8 $HEETSSHEET 3.

MEN

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J. s. GULLBORG. DIE CASTING MACHINE.

APPLICATION FILED MAY 24. 1918.

J. S. GULLBORG. ms CASTING MACHINE. APPLICATION FILED MAY24. 1918.

8 SHEETSSHEET 5.

Patented Nov. 18, 1919,

i. i i I l l I l J. S. GULLBORG. DIE CASTING MAC H!NE. APPLICATION FILED MAY 24. 1918.

Patented Nov. 18, 1919.

J. S. GULLBORG.

DIE CASTING MACHINE. APPL|CAT|0N FILED MAY 24, 1918 Patented Nov. 18, 1919.

8 SHEETS-SHEET 8.

' processes.

- zle,

. scribed die casting machine,

. encebeing have heretofore been object of my invention is I, r I I I Q p v p I JOHN S. .GUIQLBORG, OF CHICAGO, ILLINOIS, ASSIGEOR'TD ALEMITE DIE-CASTING &

MFG. 00., or cmcAc'a LLmoIsjA conroaa'rron or rumors.

mn-c'as'rm'e macnmn.

To all whom it may comzem:

' Be it known that I, Jon S. GULLBORG, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented .a certain new. and useful Improvement in Die-Casting Machines, of which the following is a full, clear, concise, and exact description, referhad'to the accompanying drawings, forming part of this specification.

My invent on relates to the art of die casting and has special reference "to improvements in die casting machines and Generally, the. object of my invention is to provide an improved automatic die cast-. ing machine. q

More specifically object is to improve certain detalls of operation, simplifying some .thereof, making others more cert-am and positive in their operation or results, and making. operations automatic which .manual. A-further to insure a higher percentage of more nearly erfect castings, to simplify the closure of t e pot and nozto automatically remove or cut off the sprue and to provide simplified automatically operated mechanism to effect these and other functions. I

My invention resides in the herein desaid machine embodying my invention'in a form which I have so far found best adapted to attain the above mentioned objects, and by means of which I am enabled to attain still other objects as will appear hereinafter.

My invention also consistsin the arrangement and pombinations of devices and parts and in the various and operation as described herein and particularly pointed out in --the' appended claims. I f

In the drawings: Figure 1; is' a proved machine, being broken away certa n parts being trative purposes;

Fig. 3 is a vertical longitudinalsectional view of the'in-achine viewed from'the same side as Fig. 1;

Fig. is aplan view of the machine,.the

-tion taken substantially on mechanism for the latera features of construction frontelevation of my the shield and other parts to best disclose thein tion,

4 Specification ofletters Patent. Patented-Nov, 18, 1919. Application flleyl May 24, 1918. Serial No. 286,288.

tion and part of theoperating mechanism 7 being shown ;1n section .on line 4 4 of i Fig. 5 is a fragmentary horizontal seethe line 5,5.

.of Fig. 3 and particularly illustrating the meansfor adjusting the pressure of'the pot nozzle against the die Fig. 6 is an end elevation of the machine looking from the left hand end Fig. 1, the shield being removed and parts of the frame broken away-to best disclose the operation of the machine; Fig. 7 is an enlarged fragmentary side elevation of a portion of the machine taken partly in section on the line Z7 of Fig. 4 and particularly illustrating the mechanism for cutting'off the sprue; Y

Fig. 8 is a view similar to Fig. 7 showing the sprue cutting parts in their final position;

Fig. 9 is enlarged fragmentary transverse sectionalvview of the machine on the line 9-9 of Fig. 7

Fig. 10' is a fragmentary plan sectional view particularly disclosin 'the cams and l movable die members; I Fig. 11 is a fragmentary detail section on the line -11-11 of Fig. 10; and

Fig. '12 is a fragmentary detail'vertical section. on the line 12-12 of Fig. 10.

'Die casting machines of this'kind have a die mold in which the articles to be produced are cast from molten metal.

The mold consists of two or more sections or parts which are adapted to be separated'to remove the castings fand to be closed. to receivethe molten metal.

' The metal is maintainedinmolten condi tion in a pot-which .is v 7 tion to the mold-at the proper instant, and

' [the molten metal is forced, under high pres-' My machine is ar.-; rangeto-hold theparts of the die in closed sure, into the mold.

arranged for connec- I 'r elation-by pressure and as the pressure under which the metal is is relatively high,

square-inch, the machine forced into the mold',

stand such pressure. to the workmen,

a sheet metal shield is provided which effectually covers the machine at this time being about-500 lbs. per; and its parts must be proportionately strong to, properly with- To 'prevent accidents during thecast'ing 'o-pera-' stop mechanism,

and prevents molten metal doing any damage or reachingthe workmen even should 'the die not be'closed at the time the metal is forced into the mold. As a further precaution there are automatic means provided to prevent the application of the pressure to force the metal into the mold-unless the shield has reached its protecting POSitlOll.

After the mold has been filled and the cast made the mold is separated, and-the ,dies are formed so that as they are sepa rated the castingis first stripped out of one of the die members and as the dies continue to open the casting is stripped or forced out of the other'die member.

' I have found that it makes the castings cleaner if the sprue is cut ofi', of the casting before the mold 'is "opened and I am enabled to accomplish this by means of my present invention.

Such machines to be economical andproperly effect the result of cutting down manufacturin the castings at a rapid rate, and as there are quite a large number of steps or operations which must occur in proper sequence, the time allowance for: each step is necessarily very limited, and each must occur in a minimum of time. w

I have found that I can greatly decrease the percentage of poor or non-perfect castings by first stripping one part of the mold from the casting and stripping the casting from the otherpart of the mold by a Q relative movement, which, though itoccu'e pies as a whole buta very short interval of time, yet during the actual stripping action and at the nistant of breaking the contact between the parts the movement is rela-- tively -slow.. This avoids the effect of a hammer-like blow and in consequence largely avoids breakages which have heretofore prevailedto agreater or .less extent.

At the close of one complete cycle of op? 5 erat1ons necessary to produce one casting, it is essential that the several parts of the machine be inspected and cleaned, before start.- ingupon the next'cycle. Itherefore provide .a very simple and positive, one cycle for the o'peratorto manually start themachine into operation for each casting and thus positively avoiding accidents which might occur should the operation-e not be manually controlled. This feature is shown in a prior application filed by me. 7

- The various functions or operations .of

the several partsof themachine are properly timed and effected by a system ofsuita able cams and cam drums andthe starting of the cycle of operation is controlled by 7 a hand lever. conveniently placed for the o erator. In the following description of t e machine, its parts, relations, functions'and operations, the many advantages which re? costs, must necessarily produce I guided to cause them,

which makes it necessaryent.

sult from my invention willbecomenap parf As'illustratedin said drawings, the frame 1 of my machine comprises a base or die plate or table 2 upon which the dies and their operating mechanism are arranged,

- and a depressed po'rtion3 at one' end of the base plate for accommodating-the metal pot andits connections, the plate bemg supported uponsuitable legs 4, 5 and 6, at each side.

The base plate is horizontaland the dies 7 and 8 which together form the mold, are arranged at one end thereof, adjacent to the metal pot 9. As relatively great pressure or rigid upright column or post 10 preferably cast integrally with the frame and arranged adjacent to the metal et 9 and against which the moldis held closed, I also vide a strong rigid pdst or upright 11 secured rigidly to the frame at the opposite end of the base plate 2. 'Between these. two uprights I arrange the dies and the mechanism for operating them and for holding them closed with sufficient pressure. To strengthen these uprights I, rigidly brace their upper ends apart and tie them together by means of the adjustable tie rod 12. While I have illustrated the die as made up of two die members 7 and stood that it may consist of a larger number of separable trated other movable parts in addition to the arts7 and 8. I s

The molds parts 7 and S each contain a portion of the mold in which the article to be cast is formed, and they are formed to close tightly together upon a median plane when the die is ready for the molten-metal.

I arrange the two mold parts upon the "base plate 2 in close proximity to the column or post 10, the back of ,the member 7 being POSItlOIlBd against the face'of the post. The die parts 7 and 8 are suitably held and when closed, to exactly register to properly form the article being cast. I'preferably secure the die part 7 rigidly against the face of the column 10 and I also preferably make the mold space 14 in this partofless depth. than the mold .space 15 in the part 8 so that as the two parts are separated'after the article is cast, the article 16- will most freely leave. or to be strip'ped'from the part 7, and will remain embedded in the movable die .part 8 until after the two parts are separated.

.For moving the die member ,8 back and forth for opening and closing the mold I provide a longitudinally slidable. cross head 17 mounted on the. base. plate 2' and guided on dovetailed guides 18 formed on the plate.

of the'dies and I provide an abutment 1% on .8 it should be under pro- .The cross head is arranged centrally back its forward end against whichIsecure a die I I7 and die part 8 which effects a slow startholder 19 and to which holder ,1 rigidly. see cure the rear die part 8. The diepart 8 thus moves back and forth with the cross head 17. R

' I provide means for moving the cross head ing into movement when beginning themold v of the die parts will moving scribed, I

' ward end of which is pivotally confihected to the cross head 17 by the cross; head pin carried in suitable bearings treme rear position,

- as indicated in Fig. 3

opening movement of the .dies and in reverse a slow closing of the dies with tremendous pressure, and also a slow stopping metal forced into, the'mold.

The metal which fills the passag die member 7 if allowed to solid fy in-placo will produce what is known as a gate 01 of the movement of the die part 8 at its ex- I forked'ends of a connecting rod 24 the for 26 rigid with the cross head.

The shaft 20 is adapted to' be rotated back and forth through slightly more than 180 of the die separatmg,

1 have provided a horizontal 'rot apin 23 projecting beyond side to receive the rear the forkedend 26" of a the rod ,24being bent'or offset as shown adiacent to its rear end to pass theshaft. The

shaft is oscillated scribed later.

The metal pot 9 for the. molten metal, the. larger one 27 contains 'a supply of -moltenmetal, and the smallerone 28, one and is inthe form of a U-shaped passage, is the passage from which the molten metal is projected or shot into the mold. As stated, thepassage or compartment 28 is arranged beneath the supply compartment and a port 29 connects the bottom of the supply compartment to the discharge passage and through which port thedischarge passage'is filled. Thisport is valve controlled. and he means for opening and closing this port will be described later.

The pot 9, as described, is arranged within the depressed 'p artof the frame and is provided with a nozzle 30 adapted to be ressed against the back of the die member to make a tight joint therewith at the time that the metal is forced into the mold. This die member is provided with an entrance or gate passage 31 leading into the mold space 1n the die and through which the metal enters the mold.

I arrangethe nozzle. 30 and the die member 7 sothat the discharge passage of the nozzle and the passage 31 reg sby mechanism to be de .run a burner p1pe45 which lies beneath the larger has two: compartments 7 the rear end upon I the ends of the shaft 48 and to permit the d Ito sprue trolled" by valves 40. A sin voperation o'f thepmachine.

Besides theroller 33 for supporting the.

- they and one feature of my invention .re-

e31 in the ter when the parts are ready to have the" lates to nieansfor cutting 01f or removing this spine in advanceof separating the two parts-of the die thismechanis'm'will be described later.

1 To bring the nozzle 30 into contact with the die member 7 I mount the pot for a slight movement back and forth from and toward the die. For this purpose I stud 32 projecting rearwardly from the column 10 and over the pot and I provide a provide a guide ooved bearing roller 33 mounted-on a, horizontal pin 34" fixed in standards 35 rising from the top plate36- of the casing or box 37 withln which the pot'is" inclosed. I mclose the pot within the box 37 to better a ply the heat from the gas burner withwhich I maintain the metal in molten condition. I provide burners 38 in the lower part of the box 37 beneath the pot. These burners are .on parallel burner pipes 39"an'd are conpipe 41 supplies fuel to all of'the pipes 39 through the connections 42 and I provide gas and air pipes 43 and 44 for supplying gle .fuel supply the fuelto the T 45 for distribution to the connections '42. Irigidly connect the gas p-P y threaded connection 46, so that-the burners and supply pipe mov with the box and the metal pot, .as the po is moved back and forth. From the upper part of the, T 45' I around the box 37-tothenozzle 30 for keeping it hotduring' the system to the box 37 by means of the forward or nozzle end of the pot,- I support a pair of vertically 3.1".

47 "one at each side and mounted at their lower ends on atransverse horizontal "shaft 48. Their upper ends are ranged side bars pivotally connected tothe' pot by means of a horizontal shaft' 48 which is carried-in a central bracket 49 on the rear upper part of the pot. The bars 47 extend down through suitable openings provided in the depressed portion 3 of the bed plate.

of the sidebars 47 are notched toreceive removal of the'pot and its casing, an are held laterally against shoulders 50 in the outer ends of the bars 47 back-and easy by cotter pins 50' shaft 48. By swinging the The upper ends,

forth the pot is'moved backv and forth on I the bearing stud 32;

bed plate I cross-connect the bars 47 by a horizontal bar 51 which I provide with solid pins or bearings holes in said bars,

52 on its en'ds, entering. see Fig. 5, and for swing,

t 2 Just above the. depressed portion 30f the 50 the'forke'd'end of the bell crank are roundedv I ing the bars back and forth; I connectthis barwith the operatin cams-of the machine as hereinafter described. g

For controlling the port opening 29 in the I 5 bottom of the supply compartment 27 of the metal pot, I provide a vertical needle valve" n ing member is lifted the valve is also lifted.

' For moving'the valve up and down I provide a bell crank 56 pivotally mounted at its elbow on a horizontal pin 57 mounted in the upper ends of the standards 35. The bell crank has. a short arm 58 which extends 'rearwardly and is bifurcated to receive the valve stem: It is adapted to contact with the lower end of the bearing sleeve 54 and lift the valve. The bell crank has a rela-.

tively lon arm 57 which extends substantially vertlcally and is pivotally mounted at its upper end'on a fixed pin 59 carried by the free end-of a bracket '60, rigidly carried by the post 10. The bracket 60 is rigidlymounted on the column 10 .'by means of a .plate 62 bolted to the column 10 by a screw 35 sion rod 12 in place. As the pot' is moved.

.back' and forth the bellcrank is swung upon bolt 63 and the nuts which secure the tenpivot and the-rear end of the/short arm is raised and lowered.

404 To cause the" bell crank to close the valve f I provide a 'com ression spring 64 on the' valve stem beneat the short arm of the .bell

crank, arranged between an upper'washer 65 and a lower'washer' 66 andI provide a .hole in-the,,valve Stem immediateIy below the lower washer 66. The two cotter pins on the valve'stem provide two stops or shoulders for opening and closing. the valve. vWhen the pot moves forward to close against the die thebell crank is swung in. such a manner that the forked endis depressed I and it yieldingly depresses the valve through.

the spring 64 and lower cotter pin and should'the valve close before the pot reaches its fin'al position the spring 64 avoids any undue strain on the valve stem. The reverse .movement. of the pot lifts the'valve through.

the medium of thelbearing sleeve and upper cotter pm. The upper and lower edges of as shown for the proper contactwithfthe i bearing'sleeveand the upper washer. p To force the metal out of the dellvery" 65- passage 28 I provide a connection and mech- '97 is mounted between its ends.

cotter pin 67 projecting through a suitable anism by which," at the right moment I force air at high. pressure into the rear end 68- of the passage 28. For this-purpose-I provide an alrfpipe 69 controlled by a hand valve 70 an an automatically operated 'valve' 71, which receives air under pressure from a supply pipe 72. The mechanism for operatmg and timing the valve mechanism 71 will be described later. 7

To produce the necessary movement of the several parts of the machme in their proper order or time relation, I provide a, pair ofcam drums 81, mounted on ashaft 82 mounted for rotation in bearings 83 and 84 carried by auxiliary frame members 85 and 86-respectivelysaid auxiliary frames having arms by which they are secured to the legs 5 and'6 of the frame,,as shown in Figs. 1 and" I 2.' These two drums are bolted togetheradjacent to their hubs by longitudinal bolts 87, so that they rotate together. To drive the drums Iprovi'de an internal gear 88' on the drum 81 and I provide a pinion 89 meshing therewith and mounted on the inner end of a horizontal'shaft 90 rotatably mounted in the bearing 91 carried by the auxiliary frame plate 86. I apply power through a belt pulley 92 carried by the outer end of the hon- 'zontal shaft 90 the means for controlling the application of power to the belt pulley w1ll be described later.

For oscillating the shaft 20 to effect the movement oflgthe dies I provide the adjacent ends of the cam drums with similar 00- operating cam grooves 93 and 94 respectively, in which Imount cam rollers 95 and 96 respectively, said cam rollers being mounted on a-short shaft or pin 97 and [I provide 'a vertically movable lever 98 arranged between the adjacentends ofthe cam drums and inwhichthe .pin or shaft 9 The lever 98 is pivotally mounted at its rear end 99 forward end 101 of the lever projects he- 'neath the shaft '20 and I transmit motion 'is likewise moved up'and down and. the

shaft 90- is oscillated back and forth; I hold the rack in proper mesh by means of an anti-friction roller 104 'which presses against the "back "of the 'rack adjacent to the gear 103. For the purpose of avbid-' at the lower end of a bracket 100 depend- "ing from the under side of theplate 2. The

ing. possible. accidents I provide atubular casing 105 into'w-hich the upper end of file-j rack-f rojects as it moves up and down. As stated hereinbefore, the shaft 20 oscillates moving the naaaeoa through an angle of slightly more than 180 crank pin 23 from. a position substantially directly in front of the shaft 20 when the dies are closed, to a position substantially directly behind the shaft 20 when the dies are open. The pin 23 rises slightly above the direct line of pressure when the dies are closed, thus in'efl'ect providing a toggle lever which closes the dies with great pressure and holds them locked in closedposition.

Onevaluable feature of this mechanism which I have provided for opening and closing the dies lies in the fact that the pin 23 travels in the arc of the circle which approaches a' line at rightahgles to the line of movement of the dies as it approaches each limit of the movement of the dies.

This arrangement necessarily results in a relatively slow opening of the dies and a relatively slow stopping of the opening movement as the movable die reaches the limit of its opening movement. As the movable die 8 begins its openin movement, it carries with it, as hereinbe ore expla ned the article 16, which has been cast and strips it 'out of the fixed die 7. The relaward end'of the connecting rod. 24 andis i be adjusted the a T-head bolt 114 the'head of which engages tively slow mdving of the die 8 at this point results in opening the die 8 with great force and-also results in the slow and easy part-- ing of the article 16 from. the fixed die 7. For the'purpose of adjusting the move ment of the movable die 8 so that it'will properly close against the fixed die 7to make a pressure tight joint therewlth I make the; connecting rod 24 adjustable as to I length. For this purpose I connect the for- 'ward end 105 of the connecting rod with the pin 25 on the cross'head by means of a threaded rod 106, the threaded end'of which projects through a collar formed on the forheld therein bynuts 107.

To strip the cast article 16 froin the movable die 8 I provide a plurality of hOIlzontally arranged strippmg pins 109v (see Rig. 7) carriedon a plate-110within the die holder 19. The plate in turn is rigidly mounted on theinner endof a horizontal tube 111: which projects centrally from the die and'over the cross'head 17. The tube is supported in horizontal position by an elongated hub 112 projecting from the die a holder 19. To effect a relative modement of the stripper pins and die member 8 tost'rip the casting out of the die memberI provide a rigid upstanding bracket 1 13 -se.cured upon' plate 2 of the machine frame by means of under 'ledges,115 rigidwith the die plate 7 and by means of which-the bracket 113 can on the plat'e'2from and toward the mold 'toproperly adjust the relative positions of the" stripper ,pin-s andthe die member 8 when the die is closed. To pro'-' I I A vide space for thisbracket 113 I provide the cross head 17 withan elongated central' opening 116 as best shown in Fig. 4. The. rear end of the tube 111 projects through the bracket 113 and I provide thereon an adjustable collar 117 to prevent. the stripper pins projectin into the 'mold' space when the dies are c osed. The collar is secured by a set screw 118. I rovide an enlarged washer 119 on the tu e 111 "between the collar, 117 and the rear face of the bracket 113. When the cross head moves the die 8 to its closed position the collar 117 effects the withdrawal of the stripper pins from the die'to casting position as shown in Fig. 7 When in this position theplate 110 contacts with the back wall of the die holder and the pins are long enough to project through the wall of the die member 8,

their inner ends being flush with the mold face. v x 7 'When the die is opened the tube 111 slides rearwardly through. the bracket 113 until the die approaches the limit ofits outward movement, at which point, as the. die is moving relatively slowly, I arrange mechanism to force the stripperpins through the die 8 to force the casting out of the die. For this purpose I provide an adjustable set! collar 120 on the tube 111 between its-ends'and adjust this collarso that it will contact with the adjacent face o'fthe fixed bracket 113 at a point suificiently in advance of the extreme outer position of the die member 8 tohold the stripper pins stationary and to' cause them t0 fo rce the casting outof the die, just as the die 1s coming to a stop in itsrearward movement. i v

I thus effect the stripping of the casting from the'fixed die 7 with apowerful slow movement and I also effect the stripping of the casting from the 'die member 8 by a similar movement.

One feature as hereinbefore explained relates particularly to the cutting oif of the sprue, and the articularmech'anism which I have devised or this purpose hasla special relation to aspecial form of castin or article; This form of article is one w ich is to be providedwith a through hole and which hole can be arranged to be produced substantially in line with the passage 31 through which the metal enters themold. In'other words, this special feature relates to the, production of small gears, wheels,

pinions and similar articles whether symmetrical or not. having a hole extending through the body of the casting.

.To effect the cutting off of the sprue I provide a rod or plunger 121 mounted centrally in the die member 8 in alinement with the passage 31 and extending through the tube 111. This. plunger is movable relatively to the die and immediately after the mold is filled with molten metal and before the metal in the passage solidifies I force this plunger forward 50 vthat its free end 122 projects 1nto the mouth of the opening 31 as best shown in Fig. 8. I cone the inner 5 end 122 of this plunger so that it will readily'enter into the mouth of the passage 31 and I make the plunger of a diameter 'to substantially fill the mouth of the passage so that when the plunger. is in the .position shown in Fig.- 8. the casting is completely severed from the metal which lies Within mount the rearend of the plunger 121 in a bracket 123, making it ad ustablein the' bracket by means of set nuts 124, the bracket being movably mounted upon the cross head 17. The bracket is. arranged centrally on the cross head between the bearings 26, in

which the cross head 'pin 25 is mounted and p it is guided inits back and forth movement by these bearings. For moving the bracket relatively to the cross head I-provide a gear rack 125 on the'lowen face of' the bracket I and a pinion 126 formed on the inner end of the horizontal shaft 127. mounted in the crosshead itself. To hold this shaft against endwise movement I provide a set screw 128 in the 'cross head the inner end of which enters a circumferential groove 129! in' the 'shaft. The bracket 123 is held downin proper mesh with the pinion by overhanging' guides 129 on the bearings 26. It will now be clear that by rotating the shaft 127 the plunger 121 can be moved relatively to the cross-head and the dies. To effect the result desired in the cutting ofi? of the sprue the plunger12l must be moved forward by' a sharp quick movement before the dies be-' gin to open, said movement, being in the form of a hammer blow. To effect the hammer-like blow desired, I

provide an arm 130's'ecured to the outer end of the,shaft- 127 and preferably formed integrally therewith, said am extending substantially vertically and a tension spring 131 having one end attached to the arm above the shaft and the other end secured to a post or pin 132 rigid with the cross head 17 and arranged forward of the shaft 127. The spring 131 tends to hold the plunger 121 at 'the forward limit of its movement, relativel to the cross hea'd. To limit the forwar movement of the plunger relative to the cross head I provide a stop'pin 133 on theicross head and a cooperating stop proect1on 134 on the lower end of the arm 130.

.These cooperating stops are in contact, as ShOWIIll'l Fig. 8, when the plunger is in its forward position relative to thedies.

To swlng the arm 13O rearwardly, thus drawlng back the plunger and lengthening .the spring 131 .I provide a latch stop 135 in the path of a projection 136 carried by the upper end ofthe arm 130' and projectingoutwardly therefrom. 'The latch stop 135 1s plvotally mounted on a horizontal pin 136 to swing in a vertical plane and isadapted the stop moves rearwardly and to engage and hold the stop 136 as the stop moves for- Ward again. I mount the latch with its ivot in the lower end of a set collar137, wh1ch I mount upon a longitudinal horizontal shaft 138 arranged at a suitable height and carto permit the stop 136 to pass the latch as a ried in carrying brackets 139 secured upon the plate 2 and I provide means for rotating the shaft slightly in its hearings to slide the latch 135 off of the pin 136 at the instant itis desired to force the plunger forwardly to cut the sprue. For this purpose I provide a crank arm rigidly mounted on the shaft 138' and extending downwardly therefrom and I provide an arm 141 pivotally mounted at its lower'end. in" brackets 142 projecting outwardly from vthe auxiliary frame plate 85 and I opera'tively connect the the free ends of these two arms by the link 143 so that. as the arm 141 is swung out and in, the shaft'138 will be rotated in its bearings. I normally hold the arm 141 at the inner limit of its movement by a tension spring 144 connected between the upper end of the arm and the frame of the ma-' chine. To force the arm 141 outwardly and thus release the pin 136 from the latch 135,.

I provide a horizontal plunger 145- mounted to move out and in relatively to the frame of the machine, provided in its outer end with a transverse notch 146 to engage the lower edge ofthe horizontal bar 147 forming part of the lever 141.- This plunger 145 is mounted for endwise movement in a suitable opening provided in a bracket 148 secured to the auxiliary frame member by a bolt 149. I provide the plunger with a collar 150 at its outer end, adapted to contact with the bracket and the collar acts as a stop t9 limit the inward movement of the arm 141. To force the plunger outwardlyagainst the action of the spring 144 and thus effect a release ,of the pin 136 from the latch 135, I provide a V-shaped cam projection 151 on the inner cylindrical surface of the cam drum 80 arranged to contact with the inner end of the plunger and force it outwardly, the plungerbeing provided 'with an anti friction roller 152 arranged for contact with the cam surface. I so arrange-the cam projection 151'relatively to the cam slot 94 which effects the opening and closing of the dies, that the pin 136 on the arm 130 is re- I leased from the latch 135 just before the dies 8 begin the opening movement, at which time the moldhas been filled.

As described hereinbefore, the pot 9 has a slight movement back and forth for position'ing the nozzle 30 a ainst the die 7 and holding it there with su cient foigce to properly control the metal and for relieving it from such position and permittingthe metal to drop back into the discharge-passage 28. To effect this slight movement of the pot and hold it in casting position with suflicient force, I provide a bellcrank lever 154 (see Fig. 3) pivotally mounted at its heel on a horizontal shaft'155mounted at its ends in the le s and arranged centrally under the 8 base late 2. It-has a relatively long h'ori zonta arm 156 extending rearwardly between the cam drums and adapted to be engaged by a cam roller 1 57 arranged between the two cam drums and mounted upon a bearing pin 158 carried by said drums,s'aid roller being arranged between the cam groove 94 and the shaft 82 upon which the drums are mounted. I hold this arm at the upper limit of its movement by means of a tension spring'158' attachedat its lower end to the rear end of the arm 156 and at its upper end to a projection 159 on the frame of the machine. The other mm 160 of the bell crank 154 is relatively short; it extends vertically and engages at its upper end .a horizontal shaft orro 161 which extends. r .across the machine and is mounted at its end 'invertically extending swinging bars 162, one'at each side; The lowerends of ithe bars 162 are pivotally mounted on the 40 cross shaft 155. Iconnect the up er ends of the bars 162 by a horizontal sha or bar 163; the construction in effect providing a swinging frame'by which the movement of the bell crank is transferred to the two sides of the machine and which frame forms virtually an extension of the shortarm 160. For connecting the'bellcrank 154 with the crossbar 51 which connects the vertical swinging bars 47 on the upper ends of which 50- the ot'rests I provide longitudinal horizontal side bars 164 connected" at their rear ends vwith the cross shaft or 'bar 163 and at their. forward ends rigidly. connected' to and spaced apart by a crossbar 165 (see Fig. 5) which in turn is connected to the crossbar I, 51 by'a centrally disposedscrew bolt 166. The bolt 166 passes through a smooth hole in the bar 165 and; screws into 'a threaded holeprovided in the bar 51-. For holding the bars 165 and-'51 ri- 'dly' together and ad justing them as.,to re ati've position, I pro"-.

.videset'scr'ews 167, one at each end of the. 'ar 165 extending through threaded holes" provided thereln and thelr ends'adapted'to 85. contact with the-adjacent side of the bar one at .each

The forward ends of the side bars 164 are rigidly connected to the crossbar 165 by the screws 168. It will now be clear that by adj'usting the screw bolt 166 and the set screws 167 I can effect a final adjustment of the pot 9 in relation to the bell crank 154 to cause the bell crank to properly position the nozzle against the fixed die 7. 4

As hereinbefore mentioned, I provide a shield 170. to protect the workmen against the possibility of the metal being forced into the die without the die being properly closed. This shield comprises a sheet metal cover, of a size to properly inclose the working parts of the machine and adapted to'be raised and lowered automatically. The shield is guided in its up and down movement upon guides 171' rising from the four corners of the machineiwh'ich are engaged by thesleeves 172 on the shield.

The upper ends of the guides 171 are connected by a light framework 173 upon-which are rovidedsuitable grooved ulleys 174 to gui e lifting cables 175 for li 'ing and lowering the shield. V

The casing is heavy enough to drop by gravity and is lifted by means of a substantially horizontally disposed swinginglever 176 pivotally mounted for swinging up and down on-a transyersely arranged horizontal shaft 177. TEEN/1'8 are two of the arms 176 I de of the machine and each carries in-its free end a rooved pulley 178'. for receiving the two ca les 175 connected to that side of the casing. The arms 176 are pinned to the shaft 177 and 'I oscillate the shaft and move the arms up and down by .means of a crank arm 180 pinned to one end of the shaft177 and having an o. crating bar 181' pivotally connected to .its ree end. The opposite end of the rod-or bar 181 is arranged adjacent-to the cam shaft 82 upon which I secure an eccentric. 182 for contact 'with the roller 183 carried in the free end of the bar 181. To guide the bar 181 in its back and forth movement I provide the link 184'pivotally connected at liJS- lower end to the bar 181 adjacent to the end in which,

the roller 183 is mounted,.and at its upper end to the frame of the machine. The weight of the casing 170.holds theroller 183 in con-' tact wlth the eccentric 182 at all times,-and' as the cam shaft82 rotates, the eccentric 182,

forces the bar .181 'rearwardly" and'the oper 'ating arms 17 6'downwardly. The free ends of the cable'sl'lfi-'pass around the pulleys 178 and are attached at their .free ends to the- 5 frame of the machine at point 185 above the 1 I arms 17 6 and consequentlythe sheaves 17 8 rest inloops of the ca les which (they lengthen when the bar 181 is forced rearwardly and b f'thus lengthening these loops they raise t e shield in an obvious manner. I so ad'ust the position of the eccentric 182 relatively'to the cam groove 94-,- 1 30 rate which effects the closing of the dies, so that the shield is at the lower limit of its movement and operative to protect the workmen when the dies are closed. Suitable openings cables 175.

As explained hereinbefore, I provide'other 'die partsand means for moving them than" the main die parts 7 and 8 and I have par: ticularly illustrated in Figs. 10, 11 and 12 the parts typical of such additional die parts. I have illustrated what may be called core pins 185' and 186 which are arranged to be projected transversely into the mold space 15 for producing holes or openings'in the article 16- to' be-cast. These pins are arranged at opposite sides of the machine and are adapt- 1 ed to be moved out and iii-simultaneously and as the operating mechanism of the two pins are substantially duplicates of each other, being merely ri ht and left, a description of the one will Su 06 for the other. The.

pin 185' is mounted in a cross head 187 movable transversely of the machine'on guldes 85 adapted to be swung horizontally to move f'the cross head 187 back and forth. The lever is supported'in position against the under side of the plate 2 'by straps 193' which are secured to'the plate, forming slots inwhich both of the levers 190 can operate. The lever 190 is pivotally mounted on the die plate by Y .a pin' 194 which is dropped into one of-a series of holes 195, providedin the die plate and enters one of they series-of holes 196 provided in the lever 190. These series .of 9 holes permits the adjustment of the fulcrum of the lever from or toward the roller 192 and thus adjusts the movement of the. cross head and the die pins 185.

offset cam surfaces in such relation to the cam groove 94 that thedie parts or pins 185- and 186 are moved inwardly after the die parts 7 and 8 are closed and are again moved outwardly before the die parts are .sepa-.

It 1s desirable that the pin 185 .or like die parts be mov'able relatively to the mold so as to cause the same to properly register. For this purpose I mount the pin 185 on a plate 185* in turn fitting within a dove tailed groove 185 Thegroove is formed in the face of the bracket 187, and I adjustably mount the bracket'on a base 187 by T-head bolts 187 whose heads engage in 186 are provided in the die plate 2 for the through the 188. The cross head is linked by a short .means of a spring 205..

l'so arrange the cam groove 191 with its to its central position.

1 208 carried by the auxiliary frame and T-slots 187 in the base 187-E. I provide a simple positive form of adjusting and lock- I ing device consisting of a threaded bolt 187 arranged parallel with the guides. threaded end enters a threaded hole 187" in the base-187 and ithas-a rigid .fixed'collar 187 between its ends which engages in' a that as the bolt'orscrew 187 is rotated the bracket 187 is adjusted on the base 187*.

I connect the base187 to the forward end ofthe lever 190 by a short link 189 pivotallyby a shouldered-pin 1 pivotally connected to the base 187% by a pin 190 which screws' rigidly into the base 187 and projects a slot 190 provided in .the *base plate2.

As explained hereinbefore, poweris derived "for the operation" of the machine pul1ey.92 which isengaged the belt 197.

shoulderedgroove 187F'in. the base 187 so H 1 connected at one end .to the end of the lever I Its I For starting and stopping the machine I provide a horizontal shaft 198- extending across the machine nd mounted'at its-ends in the legs '5. This'sha'ft 198 carries a hand lever 199 rigidly mounted thereon and pro jecting upwardly at one side of the machine in convenient position to'b'e grasped. by the operator. I? arrange acrescent 200-adjacent to the lever 199 and having a central notch- 201 and side notches202 and 203. These notches are adapted\to receive the inner end of a. sliding stop 204 carried bythe hand lever'199. and normally thrust inwardly by The center notch 201 maybe. termed a neutral notch for when'the lever is" in a central position the machine is at rest; The right hand "notch 202 is the forward running notch because when the lever is shifted'withthe dog in this notch the'machine runs in'a forwardly direction; when the leveris 're'versed'to enter the dog in the lefth-and notch chine runs backward. c.

Adjacent to the crescent *200 I arrange "a quadrant 206 having notches 206 inits edge registering with the notches in the crescent 200 and which have inclined or cam shaped ends and adapted, when centrallypositioned, to permit the dog orstop 204entering any one of the three notches and 1 adapted when moved from its central position .to engage the dog-and raise it suiti ciently to free'it from the notch inwhich lt is placed; that is, from either of the end 120 notches to permit the handle 199 to return quadrant 206 for releasing the-handle lever 199 I provide a short vertical lever 207 mounted on the outer end of a short shaft 203, the ma I having at its inner end a crank arm 209 carrying. at its free end an anti friction roller 210 adapted for engagement with a double coned cam projection 211' carried by .130

For swinging the D dog 204 nected at onev end 'to center notch.

the cylindrical inner surface of the .cam drum 80. The free endof the arm 207 is linked to the quadrant 206 bymeans of a connecting'link 212, so that when the cam projection quadrant 206 moves sufiiciently to free .the from one of the side notches and permits the hand lever 199 to return to the I provide aistop 213 on the auxiliary frame 85 in the path of a projection 214 on the lower end of the lever 207 to limit the movement of the quadrant 206 in one direction, and to normally holdthe quadrant in such position with the stops engaged,-I provide a tension spring 215 conthe free end of the lever 207 and at the other end to the frame of the machine.

The shaft 198 extends through the machine from side to side and at its other end I mount a swinging lever. or crank arm 216 which stands vertically when the machine is at rest and is adapted to be swung forward or back with the hand lever 199 for starting the machine. Adjacent to the free end of th lever 216 I secure a cam cross bar 217 pro ecting from both sides of the lever 216, its upper edge 218 adapted to engage an anti-friction roller 219 in the free end of a lever 220 which is pivotally mounted on the frame of the machine at 221. This lever 220 carries a brake shoe 222 adapted to engage the rim of the pulley 92 when the lever 216 1s 1n its central or neutral position and hold the machine against operation. 'VVhen the lever 1s moved into one of the end 5 notches, as indicated on Fig. 2, in full lines,

the arm 217 lifts the lever 220 and frees the pulley 92 from the brake 222. The free end 0f the arm 216 is' connected by means of a link 223 to the fre -end 224 of the horizontally swinging lever 225 pivotally mounted on the top of the base plate 2.. This lever 225 is linked to a second horizontally swinginlg lever 226 by a horizontal link 227. The

horlzontal swmging lever 226 is mounted on the lower end of a vertical shaft 228 which extends upwardly above the machine and is connected to operate suitable clutch unechanism, not shown, for controlling the operation of power to run the belt 197 to operate the machine either forward or? backwa l as desired and as designated by the position of the hand controlled lever 199.

trolled lever 199 to its central neutral po 'sition from either of its operating positions and for applying the brake with sufiicient force I provide a strong tension spring 229 connected at one end to the free end 230 of the brake'lever 220 and at its other end to a 'bracket 231 rigid with-the frame of the The spring 229 holds the lever machine.

220 and its roller 219 tightly against the cross bar 217 and is adapted to force the arm 211 strikes the canrroller 210 the dangerous feature nism 71 for the anti-friction roller 235 nearly around the 1 but is cut away at 244' to provide a depressed portion For positively throwing the hand con- 216 to-a central position from either side and thus carry the hand lever 199 to its neuandat such time the sprin 229 holds the pulley 92.

In the operation of the machine the mostis the possibility that the air pressure may be applied to the molten metal to force the metal out of the pot before the dieis properly closed, and for the purpose of afi'ording absolute protection to the workmen should such an accident occur, I prevent the operation of the valve mechathe application of the air until the "casing 170' reaches its lowermost or protecting position. For this purposeI provide a vertical lever 232 pivoted between its ends at 233' upon the frame of the machineand I provide a vertically disposed cam surface 234 on the adjacent side of the casing 170, the upper end of the lever 232 beingprovided with an anti-friction roller235 for contact with this surface. The valve mechanism 71 is provided with a valve stem 236 and for moving the valve stem to operate the valve and admit air to the pot I provide a link 237 connected at one end to the free end of the valve stem 236 and at its other end to a vertically swinging lever 238 pivotally mounted at one end upon the frame of the machine and linked at its other 232 by a link 241. A tension spring 242 is also attachedto the free end of the lever 233-- and tends to hold the same forwardly with of, the lever 232 in contact with the cam surface 234 on the casing and also tends to move the valve rod 237 in a direction to admit, air to the pot. The cam surface 234 on the casing is curved forwardly at its upper end 243 to permit the upper end of the lever 232 to swing for-,

wardly when the casing reaches its lowerv most position and'permit the spring set the valve to admit air to the pot.

ll do not'jdepend wholly upon this safety device preventing the premature opening of the valve, but I provide a cam surface244 on theperiphery of the cam drum 81- adapted to engage a cam roller 245 on the free end of a swinging a the inner end of a horizontal shaft 247 upon arm 246 secured rigidly upon which the vertically swinging lever 238 is mounted. The cam surface 244 extends periphery of the cylinder to permit the-arm 246 to swing inwardly. The depressed cam surface 244" permits the lever 238 to swing to open the air valve in response to the action of the spring 242. Should the casing not be at its protecting position when the arm 246 is free to swing'inwardlv then the lever 232 andcam surface 234 will prevent the opening of the air valve. It should be understood that the pot casing is provided with a suitable door '37 to give access to the burners and also with a suitable cover 248 to permit the feeding of metal into the pot. I preferablylock'the cover closed by a weighted lever 249 pivotally mounted between its ends' onthe free edge of the cover between upwardly projecting lugs- 250 and provided with. a' hook 251 on its lower edge adapted to engage beneath a staple or loop 252 rigid with the top of the pot. The lever is provided with an outwardly extending handle which can be grasped to lift the cover 248' and the inner end of the lever. is provided with .a

downwardly extending projection 2'54 adapted to contact with the-upper surface of the I versely movable die parts 186 a they are used, are then moved inw' rdly, the a pot is then. swung-forwardly: to bring the nozzle into lowered and. when the other parts are in lowermost position and permits the valvemechanism to be operated as soon as the cam 244 permits the lever 238 .to swing and permits the operation of the valve mechanism by the spring. As the depressed cam surface" 24 1f is relatively short the valve .can becover when the handle. part is lifted and thus hold the lever in rigid liftmg-posltion.

' .The cam controlled sequence of operations of the machine is such that when the handlever 199 is moved to the right hand notch from the center notch the mechanism applies power to the belt'to run the machine-in a forward direction, the die part 8 is first closed against the die part 7, the trans-v proper contact with the die part 7. In the meantime the casing is being proper position the casing has reached its opened only during a small angular movement of the drum shaft, but as soon as the raised cam surface 244. contacts with the roller 245 the valve, is positively closed. As'

soon as this point. is reached the plunger 121 is forced through the, sprueopening to cut the sprue off and then-the openingmove; ment ofth'e die part 8 begins stripping the casting out of the die part 7. During this time the casing also is'. being raised to its upper. position, The opening movement of the dies continues and as the die part 8 nears a suitable telescopicventpipe 255 to carry away the fumes and to permit the ,up and down movement of the shield.

'I claim:

1-. In a power" operated die casting ma chine, two cotiperating" mold forming dies,

opening movement to beginv and rela- 'tively slowly; 3 1 2. In adie casting machine, two relatively movable mold parts, means for separating the two parts with a movement which begins relatively slowly and gradually increasesto a maximum substantially'midwayof the extent of movement and then decreases gradu-- ally to the limit of its movement, and means p .forstripping the casting from the mold while the said movement is decreasing. 3. In a die castin machine, a fixed die part and a' cooperatmg relatively movable die part, a shaft'rotatable back and forth through substantially-180, a crank pin carried by the shaft, the. positlons' ofrest ofthe pin being substantially in .alinem'ent with saidjmova'ble die. parts, connections between 135 the pin and the movable die part for moving the'die part back and forth as the shaft. oscillates, and whereby-the die part starts and stops relatively slowly! 4 '4. In a die castlngmachine, a part and a cooperating movable "die part, .a 1 shaft rotatable back and forth through sub." stantially'18(), a crank pin carried b the shaft the positions of rest'of the pin ing substantially in alinement with the movement of said movable die part, and means connectin the crank'gin with the movable die part w ereby the ovable die part starts and"s'topsirelatively slowly; and strippers carried by -the movable die part for strip. 1 ping the casting therefrom as it stops. 3

'5. ha die casting machine, a die mold adapted to'be opened and. closed horizontally, the mold provided with .a' hori zontal inlet passage, a metal pot having a delivery nozzle and adapted to be moved horizontally to position .the nozzle against the mold in register with said passage, a .cam shaft operatively connected with .the mold and the; pot for closing the mold and for moving the pot, and a plunger carried by the mold adapted to out .0 communication between said passage and themold space and-cam means earned by said shaft for e ectin'g. the :cutting off movement of said plunger before the mold begins to open. v

-6i Ina-die castingmachine, a die-part I having an inletpassage for-molten metal,

and a movable part for closing and opemng the mold, a plunger carried by themovable 12 part and adapted to be projected through the mold space into the mouth of said passage to cut off communication. between same,

- means normally tending to hold the plunger -in projected position, means'for withdrawing the plunger as'the mold is closed, and means for releasing the plunger before the moldis opened.

fired dieao 'F. In a die casting machine, a die part having an inlet passage for molten metal,

' and a movable part for closing and opening sage to the mold, a plunger carried by the movable part and adapted to be projected through the mold space into .the mouth of said pasa cam shaft, cam means for moving the movable mold part back and forth, means connected with the movable mold part fornormally holding said plunger in relatively 8. In a die casting machibe, a mold comprising a fixed partand a relatively movable part, a rotatableshaft for operating the movable part, a crosshead carrying the movable part, and a connecting rod operatively joining the crosshead and the shaft, the fixed part having an" inlet passage to admit the molten metal to the mold, a plunger carried the movable part adapted to be projected means carried by the crossinto said passage,

head for normally holding the plunger in relatively projected position, means carried by the machine for holding the plunger back as the mold 'is closed, and cam means for releasing the plunger holding means before the mold is opened.

9. In adiecasting'machine, a die part movable back and forth to open and close the mold,- a shaft oscillatable, through substan-.

tially 180 and means operatively connect-f mg the'shaft and die part for moving the J same back and forth, a cam shaft,cam means "for oscillating the first mentioned shaft back and forth, a metal pot movable horizontally to contact with the mold, cam means on the cam shaft for moving the pot back andforth, means carried by the mold for closing .the connection between the pot and the mold space, and cam means carried by the cam shaft for causing 10. In a die casting machine,

' having an inlet passage for molten metal,

communicating with said passage,

' against a .mold,

a sprue cutter carried by the mold, means for moving said cutter relatively-to; said mold to cause it to entersaid passage, said means adapted to at the beginning of th movement of said cutter. v 11. having a delivery passage, and a reservoir a valve controlling said communication, said pot movable horizontally for positioning it a bell crank lever pivotally mounted on a fixed bracket on the-machine and also pivotally connected to the pot, and an arm on said lever adapted .to depress the cut off communication'between same, I

from the stop before the lever engaging the I the connection to be closed before the pot is moved away from the mold.

a die mold apply its maximum force In a die casting machine, a metal pot valve to close such communication as the pot from casting position.

12. In a. die casting machine, a metal pot having a reservoir and a metal delivery passage, a port connecting the lower part of the reservoir and the passage, a valve extending through the cover of the pot and controlling such port, aguid'e for'the upper end of the valve, a vertically movable sleeve insaid guide,

a. compression spring surroundingthe valve stem below said sleeve, a shoulder on the valve above the sleeve and a shoulder on the valve below the spring, a lower end of the sleeve and the upper end of the spring and adapted to move the valve up and down to open and close the port, the lever pivotally mounted between-its ends on the cover of the pot and pivotally mounted at-its opposite end in a bracket fixed to the frame of the machine, whereby when the pot ismoved forward to casting position and backward from casting position, the port is closed and opened respectively.

13. In a die casting machine, a metal pot movable for closing the nozzle of the" pot against the mold, a horizontal guide for the 'nozzle end of the pot and a swingingv lever supporting its rear end, a cam shaft, cams and cam rods connecting said lever to the cam shaft, and an adjustable connection interposed between the cam rods and said-lever for effecting the relative position of the pot to cause the cam to position the nozzle of the pot against the mold with the desiredpressure,

14:. In a die casting machine, a die part movable to open and close the mold,.cam

means for effecting the movement of the force to'move' the die part at the operatively connecting movable to open and close the mold, cam

means for effecting the movement of the diepart', the cam means and the die part, said mechanism including, means for effecting the relatively slow movement of the diepart at the beginning and ending of its openingmovement.

mechanism operatively connecting- 16. In a die casting machine, a (lie part movable to open and close the mold, cam means operatively connected to the die part for moving same, means interposed in said connection for causing the die part to move relatively slowly at the beginning and ing of its opening movement and to increase end- 17. In a die castin machine, adie part movable to'open and close the mold, cam

'same, and atoggle leverdevice interposed in-the .connectlon to effect the relatlvel y slow andp'owerful movement of the die part atthe beginning andendingofits opening 10 movement;

cam means connected to the diejpart for reciprocating same, and a toggle lever dethe relatively slow and powerful movement of-the die part at the beginning and end} -in'g of its openingand closingmovement.

19.. In a die casting machine, a die part m ov'ab1e to open and close the'mold, a shaft K drotatable through substant1alliyb180 degrees toopen the, mold, a pin carrie y the shaft, 5 a I connecting rod mounted on the .pin for a moving thedie part, the limiting ositions of the pin being-substantially in a inem e nt -ment with the longitudinal movement with the connecting rod, and cam means for (gscillating the shaft. v

2 1.- In a die casting machine, a die part reclgrocable to open and close-the mold, a

she rotatable back and 'forth through substantially 180 degrees to open and close the mold, an eccentric bearing carrie by the shaft, a connecting rod mounted on the bearmg and operatively connected to said die part, the positions of rest of said bearin being substantially in alinement with the line of reciprocation of the opposite end of shaft; a rac means for .rec late the shaft. I I

22. In a die casting machine, a die part reci rocable to open-and close the mold, a

meshin g with the gear and iprocatmg the rack to oscilsha t oscillatable back and'forth ,3 substantially 180 degrees to open and close the mold, a crank pin carried by the shaft, a connecting rod mounted on the pin and operatively connected to said die part, a gear and a reciprocating rack for oscillating the shaft, and cam means for reciprocating the rack. a I

23. In a diecasting-machine, a .die part meansv connected to the die part for moving 18.- In adie casting machine'a die part; reciprocable to 'openand closef'the mold,

vice interposed in the connection to effect movable back-and forth to open with thelongitudinal movement of the,con-' necting rod, and cam means for timing" the grees to reciprocate said die ciproca ting the die part, the limiting posihons of the pin being substantially in aline.

the connecting rod, a gear carried byvthe' through reciprocable for o ening and closing the mold, a shaft oscil atable through substantially 180 degrees to open and close the mold, a crank pin carried by the shaft, aconnectdrums .having cooperating cam grooves in their opposedends, .a swmgmg lever disposed-between the drums its free end con" nected to said mack, and operative ,connectlonfbetween- Sald grooves in the drumsand' said lever for swingingsame.

24. In a die casting-machine, a die part the mold, ,a shaft "oscillatable through. substantially 180 degrees to open and close the mold, a crank pin carried by the shaft, a

connecting rod mounted on the pin and operatively connected to said die part, a gear- 86 end, a, swinging lever associated with the 3 ivotally connected to said rack, a pincarr ed by the lever enter- 'ing said groove and a roller-on the pin, and

drum, its free end means for holding the rack in mesh with the gear as the rack is reciprocated by the lever.

'25.- In a diecastingmachine, a die part movable to open and close the mold,- a shaft oscillatable, through substantially 180 degrees for effecting a relatively slow movement of said die part at the beginning and ending of its opening movement, a-gear carried by' the shaft, a reciprocable'rack .en-v gaging the gear, 'a roller back of the rack holding it in. mesh, cam means for'reciprocating the rack, including a swinging lever pivotally connected at its free end to one I endof said rack.

26. In a die casting machine, a die part movable back and forth to open and close the mold, .a shaft oscillatable through subg stantially 180 degrees to eife'ct the relatively slow and powerful movement of said dle part at the beginning and ending of its .opening movement, a crank pin carried by the shaft,;a reciprocable cross head mounted on the machine and connected to the die part, a connecting rod operatively connects 'ing the cross head and the crank pin, and means ref adjusting the length of the rod:

to adjust the closing position and pressure, of said die part,

27. In a die casting machine, a metal pot I comprising a U-shaped passage and a reservoir lyingbetween -the armsthereof, a valve having a passage connecting the bottom of the reservoir 'With the bottom of the U shaped passage, a die mold, a nozzle for the front 'end of the passage, means'for support-- and close '80 I 

